www/mod_wsgi4: Update to 4.9.4

Remove also the Python version limitation since none is documented.

PR: 284310
Approved by: jrm (mentor), douglas@douglasthrift.net (maintainer timeout)
MFH: 2025Q1
Release Notes: https://modwsgi.readthedocs.io/en/latest/release-notes/version-4.9.4.html

(cherry picked from commit bf1f4b75e89117abdcbb0d86550fcad56097b6ef)